The 64 Studio Platform Development Kit (PDK) is a
version control system for GNU/Linux
distributions, allowing the creation and
management of many different projects, based on
Debian and Ubuntu sources. PDK is written in
Python, and the source code is well commented and
contains documented examples.

ADQ is a project that aims to provide device drivers
and a terminal based data acquisition and control
program for the Meilhaus ME26 data acquisition
board, and the Meilhaus ME53 relay boards. The
data can also be displayed in real time with a Web
page.

The Advanced Linux Sound Architecture is composed of several parts. The first is a fully modularized sound driver which supports module autoloading, devfs, isapnp autoconfiguration, and gives complete access to analog audio, digital audio, control, mixer, synthesizer, DSP, MIDI, and timer components of audio hardware. It also includes a fully-featured kernel-level sequencer, a full compatibility layer for OSS/Free applications, an object-oriented C library which covers and enhances the ALSA kernel driver functionality for applications (client/server, plugins, PCM sharing/multiplexing, PCM metering, etc.), an interactive configuration program for the driver, and some simple utilities for basic management.

ARB SRAM Linux driver is a device driver for AR-
B1047 SRAM chips installed on the Acrosser
AR-B1047 board. It provides a method of
storing files that can be accessed by user
applications for data that must be retained
after a power loss.

The AROS Research Operating System is an effort to implement an Open Source and portable operating system that is compatible with AmigaOS(TM) 3.1. It was originally meant to be a direct reimplementation, but AROS currently has features which do not exist in AmigaOS(TM).

This driver allows the Linux kernel to use the ATA over Ethernet (AoE) network protocol. Using AoE, a Linux system can use AoE block devices like EtherDrive (R) storage blades. The block devices appear as local device nodes (e.g. /dev/etherd/e0.0).

AWOS is a fast, highly optimized operating
environment that strives to be POSIX compliant.
Care is taken to ensure that it can run on very
old hardware, yet still allow it to take advantage
of the newest platforms.

Accessfs is a file system to manage permissions. It is not very useful on its own. You need to load other modules like "User permission based IP ports" or "User permission based capabilities". With these modules there's no need anymore for most Internet daemons to run as root.

ABISS (Active Block I/O Scheduling System) is an
extension for the Linux kernel that implements
priorities for disk IO operations, and that
provides a means for applications to use these
priorities to obtain real-time (e.g. a guaranteed
data rate) and prioritized best-effort services.
The kernel code is supported by a user space
daemon and a library.